I need to replace the backing up light bulb in a 2003 Beetle convertible. I see the two screws and I have tried to loosen them. When I do the outside cover starts to come away from the bumper. But after a bit of turning the stem starts to move with the nut. Just want to make sure I am doing this correctly before I go to far with it. Seems like I should be able to just remove the light bulb without removing the entire bracket.